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论文类型： 会议论文

发表时间： 2016-11-30

收录刊物： EI、CPCI-S

卷号： 9994

页面范围： 329-334

关键字： Information retrieval; Learning to rank; Group ranking

摘要： According to a given query in training set, the documents can be grouped based on their relevance judgments. If the group with higher relevance labels is in front of the one with lower relevance judgments, the ranking performance of ranking model could be perfect. Inspired by this idea, we propose a novel machine learning framework for ranking, which depends on two new samples. The first sample is one-group constructed of one document with higher relevance judgment and a group of documents with lower relevance judgment; the second sample is group-group constructed of a group of documents with higher relevance judgment and a group of documents with lower relevance judgment. We also develop a novel preference-weighted loss function for multiple relevance judgment data sets. Finally, we optimize the group ranking approaches by optimizing initial ranking list for likelihood loss function. Experimental results show that our approaches are effective in improving ranking performance.